Police say the son of Pakistan's president has escaped a roadside bomb attack unharmed after the blast killed three people and wounded 15.

The attack happened late on May 24 in Pakistan's restive Balochistan province.

Police official Ghulam Rasool says the bomb, planted on a motorcycle and detonated by remote control, exploded in the province's Hub industrial area as a vehicle carrying Suleman Mamnoon Hussain passed by.

Rasool says the dead and most of the wounded were pedestrians, though some police officers accompanying Hussain were wounded.